Applications Automotive
Automotive
Forty motors in every car: winding wire for automotive components
A mid range car carries somewhere between thirty and eighty small motors, solenoids and sensor coils. None of them is glamorous, all of them have to last fifteen years, and each is wound from a slightly different wire.
Where the wire goes
Window regulators, seat adjusters, mirror motors and sunroofs are the obvious ones. Behind the dashboard sit blower motors and actuators for every flap in the HVAC system. In the engine bay there are fuel pumps, cooling fans, throttle actuators and the solenoids in the ABS block and the automatic transmission's valve body. Electric power steering alone uses a motor bigger than all the rest put together.
Then there is the coil side: ignition coils, injector solenoids, relays by the dozen and sensor coils for wheel speed and crank position. Gauges run from SWG 20 down to SWG 43 and finer, and the winding equipment for the smallest ones runs at speeds where a single lump in the enamel stops the line.
What automotive winders specify
Consistency matters more than any single property. A wire that is a little thicker than nominal fills the slot early and the last turns scrape; one that is thinner leaves the coil loose and noisy. We hold conductor diameter to the tighter half of the IEC 60317 tolerance band and check it with non-contact micrometers on every line.
Springback and elongation decide how the wire behaves on a high-speed flyer winder, so we control anneal temperature per gauge and log the results. Self-bonding coats are used on coreless and air coils so the finished coil holds its shape without tape or varnish. Polyester Grade 2 is the workhorse for Class 155 components; polyesterimide for Class 180 parts near the engine.
Under-bonnet heat, salt and vibration
Anything mounted on the engine or under the floor sees temperatures from minus 40 to 150 °C, road salt spray and continuous vibration. The enamel must not craze in the cold, must not soften in the heat and must stay bonded through a million thermal cycles. Polyesterimide with a polyamide-imide overcoat handles all of that; for solenoids immersed in transmission fluid we recommend a chemical-resistant Class 200 build and can supply test data against the fluid you use.
Documentation for PPAP and IATF
Automotive tier suppliers need more than a good wire. They need a certificate of analysis with each lot, traceability from cathode to spool, control plans and, at programme start, a PPAP submission. We supply all of it: batch test reports ship with the goods, our copper is bought against mill certificates, and we will support your PPAP with samples, capability data and a process flow for the enamelling line.
Key takeaways
- Diameter, springback and surface consistency are what keep automated winders running; ask for the tight tolerance band.
- Polyester Grade 2 for cabin components, polyesterimide plus polyamide-imide for anything under the bonnet or in fluid.
- Batch certificates and PPAP support come with the wire.
